실습 : 버튼을 사용해 한글이면 영어로 영어면 한글로 바꾸는 코드
Button.js
import React, {useContext} from "react";
import LangContext from "./LangContext";
function Button({toggleLang}){
const lang = useContext(LangContext);
return <button onClick={toggleLang}>{lang}</button>;
}
export default Button;
LangContext.js
import {createContext} from "react";
const LangContext = createContext("en");
export default LangContext;
Message.js
import React, {Component} from "react";
import LangContext from "./LangContext";
class Message extends Component{
static contextType = LangContext;
render(){
const lang = this.context;
if(lang === "en")
return(
<p>
"Context provides a way to pass data through the component tree
without having to pass props down manually at every level"
</p>
);
else
return(
<p>
"컨텍스트는 모든 레벨에서 일일이 props를 넘기지 않고도 컴포넌트 트리에
걸쳐서 데이터를 전달할 수 있는 방법을 제공합니다."
</p>
);
}
}
export default Message;
Title.js
import React from "react";
import LangContext from "./LangContext";
function Title() {
return (
<LangContext.Consumer>
{lang => {
const text = lang === "en"? "Context" : "컨텍스트";
return <h1>{text}</h1>;
}}
</LangContext.Consumer>
);
}
export default Title;
App.js
import React, { Component} from 'react';
import Button from "./components/Button";
import Title from "./components/Title";
import Message from "./components/Message";
import LangContext from './components/LangContext';
class App extends Component {
state = {lang: "en"};
toggleLang = () =>{
this.setState(({lang}) => ({
lang: lang === "en"? "kr" : "en"
}));
};
render() {
const {lang} = this.state;
return (
<LangContext.Provider value={lang}>
<Button toggleLang={this.toggleLang} />
<Title/>
<Message />
</LangContext.Provider>
);
}
}
export default App;
실행 결과 :
실습2
AddNumber.jsx
import React, {Component} from "react";
class AddNumber extends Component {
render() {
return (
<div>
<h1>Add Number</h1>
<input type="button" value="+"/>
<input type="text" value="0" />
</div>
);
}
}
export default AddNumber;
AddNumberRoot.jsx
import React, {Component} from "react";
import AddNumber from "./AddNumber";
class AddNumberRoot extends Component {
render() {
return (
<div>
<h1>Add Number Root</h1>
<AddNumber></AddNumber>
</div>
);
}
}
export default AddNumberRoot;
DisplayNumber.jsx
import React, {Component} from "react";
class DisplayNumber extends Component {
render() {
return (
<div>
<h1>Display Number</h1>
<input type="text" value="0" readOnly/>
</div>
);
}
}
export default DisplayNumber;
DisplayNumberRoot.jsx
import React, {Component} from "react";
import DisplayNumber from "./DisplayNumber";
class DisplayNumberRoot extends Component {
render() {
return (
<div>
<h1>Disply Number Root</h1>
<DisplayNumber></DisplayNumber>
</div>
);
}
}
export default DisplayNumberRoot;
App.js
import React, { Component } from 'react';
import './App.css';
import AddNumberRoot from './components/AddNumberRoot';
import DisplayNumberRoot from './components/DisplayNumberRoot';
function App() {
return (
<div className="App">
<h1>Root</h1>
<AddNumberRoot></AddNumberRoot>
<DisplayNumberRoot></DisplayNumberRoot>
</div>
);
}
export default App;
App.css
div {
border: 5px solid #764abc;
margin: 10px;
color: #764abc;
padding: 10px;
}
실행 결과
X
X
기능을 정말 하나하나 나누어 구현한다는 점이 귀찮게 느껴졌지만 그만큼 개별적으로 작성되는 만큼 수정이 용이 할 것이고 팀원들과 함께 할 경우 더욱 좋을 것이라 느껴졌습니다.